<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Grid Demo</title>
    <style>
        .child3 {
            height: 30px;
            width: 100px;
            background-color: salmon;
        }
        .grid-container {
            height: 600px;
            width: 600px;
            background-color: black;
            display: grid;
            /* grid-template-columns: 60px 60px auto; */
            /* grid-template-columns: 60px 60px auto 1fr; */
            grid-template-columns: 60px 60px auto auto;
            grid-template-rows: 100px 200px;
        }
    </style>
</head>
<body>
    <div class="grid-container">
        <div>111</div>
        <div>222</div>
        <div class="child3">333</div>
        <div class="child3">444</div>
    </div>
</body>
</html>